In Java, polymorphism results in code that is more concise and easier to maintain. This tutorial provides an overview of the four types of Java polymorphism, but our focus is subtype polymorphism.

It’s possible to design a powerful structure in your code using polymorphism. Take the Java polymorphism challenge! Let’s try out what you’ve learned about polymorphism and inheritance.

From the standpoint of the compiler, the above code properly implements polymorphism and abides by the rules of inheritance in Java. However, this code fails to meet the philosophical and behavioral ...